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Method for preparing concrete high-efficiency water reducing agent by utilizing phenanthrene

A high-efficiency water-reducing agent and concrete technology, which is applied in the field of using phenanthrene to prepare a concrete high-efficiency water-reducing agent, can solve the problems of large slump loss, poor workability of cement mixture, and inability to be used in combination.

Inactive Publication Date: 2010-06-16
JIANG SU TMS CONCRETE ADDITION AGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cement mixture of this type of product has poor workability, and there are problems of low water reducing rate and large slump loss
The ionic high-efficiency concrete water reducers mainly include naphthalenesulfonic acid formaldehyde condensate, phenol / p-aminobenzenesulfonic acid formaldehyde polymer, anthracenesulfonic acid formaldehyde condensate, and sulfonated methylolated melamine, etc. The product has a wide range of applications, but it cannot be used in combination with most comb polycarboxylate varieties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put 1200KG phenanthrene into the reaction kettle, add 1900KG concentrated sulfuric acid, when the temperature rises to the specified temperature, start stirring, adjust the sulfonation temperature to 123-127°C, and keep it warm for 3 hours. The detected acidity should be within the control range. After confirming that the sulfonation terminal parameters are normal, enter the hydrolysis process. Under the condition of stirring, add 1800L of dilution water, stir for 20 minutes, and check the acidity, which should be within the specified range of 27-29%. Control the diluted sulfonated material at 75-80°C, add 430L of 30% formaldehyde solution, slowly raise the temperature to 95°C, and keep the temperature for 3 hours. Add 1500KG water, add sodium hydroxide to neutralize after dilution, and adjust the pH to 7-9.

[0013] Perform performance test on the obtained high-efficiency cement superplasticizer:

[0014] (1) Fluidity test of cement paste

[0015] The fluidity of c...

Embodiment 2

[0025] Put 1200KG phenanthrene into the reaction kettle, add 1400KG sulfuric acid, when the temperature rises to the specified temperature, start stirring, adjust the sulfonation temperature to 145°C, and keep it warm for 3 hours. The detected acidity should be within the control range. After confirming that the sulfonation terminal parameters are normal, enter the hydrolysis process. Under the condition of stirring, add 1300L of dilution water, stir for 20 minutes, check the acidity, it should be within the specified range of 20-22%. Control the diluted post-sulfonated material at 75-80°C, add 420L of formaldehyde in 40% formaldehyde solution, slowly raise the temperature to 95°C, and keep the temperature for 3 hours. Add 1300KG water, add potassium hydroxide to neutralize after dilution, and adjust the pH to 7-9.

[0026] Perform performance test on the obtained high-efficiency cement superplasticizer:

[0027] (1) Fluidity test of cement paste

[0028] The fluidity of c...

Embodiment 3

[0038] Put 1200KG phenanthrene into the reaction kettle, add 1900KG sulfuric acid, when the temperature rises to the specified temperature, start stirring, adjust the sulfonation temperature to 123-127°C, and keep it warm for 3 hours. The detected acidity should be within the control range. After confirming that the sulfonation terminal parameters are normal, enter the hydrolysis process. Under the condition of stirring, add 2100L of dilution water, stir for 20 minutes, check the acidity, it should be within the specified range of 25-27%. Control the diluted sulfonated material at 75-80°C, add 162KG of paraformaldehyde, slowly raise the temperature to 95°C, and keep it warm for 3 hours. Add 1500KG water, add calcium hydroxide to neutralize after dilution, and adjust the pH to 7-9.

[0039] Perform performance test on the obtained high-efficiency cement superplasticizer:

[0040] (1) Fluidity test of cement paste

[0041] The fluidity of cement paste is tested with referenc...

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Abstract

The invention discloses a method for preparing a concrete high-efficiency water reducing agent by utilizing phenanthrene, comprising the following steps of: (1) sulfonation reaction: adding concentrated sulfuric acid with a weight ratio of 2:3 with the phenanthrene to the phenanthrene, and keeping the temperature for 1 to 5 hours at the temperature of 80 to 140 DEG C; (2) dilution: diluting sulfonated bodies after sulfonation reaction by adding water, wherein the acidity after dilution is 20 to 30%; (3) condensation reaction: adding paraformaldehyde with a mol ratio of 0.75 to 1.1 with the phenanthrene and 30 to 40% of formaldehyde or acetaldehyde aqueous solution to the materials after dilution under the condition of 80 to 120 DEG C, and keeping the temperature for 2 to 5 hours; and (4) neutralization reaction: adding alkali, and adjusting the pH value to 7 to 9, wherein the alkali is the alkali of kalium, natrium, calcium and quaternary ammonium salt ions. The water reducing rate is 26% when 0.75% of doping amount of solid is singly used according to the concrete high efficiency water reducing agent prepared by the invention, and the later strength of concrete is increased to 140%.

Description

technical field [0001] The invention relates to a preparation method of a novel concrete water reducer, in particular to a method for preparing a high-efficiency concrete water reducer by using phenanthrene. Background technique [0002] In the operation of cement mixture, in order to make the operation labor-saving and effective, and early demoulding shorten the construction period, the cement mixture is required to have high fluidity, effectively inhibit the loss of slump, and have sufficient early strength at the initial stage of hardening, it is necessary to add Concrete superplasticizers, currently my country's concrete superplasticizers are mainly Nai series and melamine series products. The cement mixture of this type of product has poor workability, and there are problems of low water reducing rate and large slump loss. The ionic high-efficiency concrete water reducers mainly include naphthalene sulfonic acid formaldehyde condensate, phenol / p-aminobenzenesulfonic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C04B103/30
CPCC04B2103/302C04B24/226
Inventor 陈国忠陈炜徐大勇
Owner JIANG SU TMS CONCRETE ADDITION AGENT